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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7531b47882dfeba09a0ac99b3903c84527349992f42a0c8dd97c3c4081a6fe74' 
  AND token = 'qKvtoCf8NFzuWRrHVfnMH665H65pjIJquMVFIunMZDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}